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specification, in which claimed.

fUNITED STATES PATENT OFFICE.

' VIRGIL WV. BLANCHARD, OF NEW YORK,- N. Y., ASSIGNOR TO J CSEPH A.

DAVIS, or SAME PLACE.

STEAM-GENERATOR.

, SPECIFICATION, forming part of Letters Patent No. 413,908, dated October 29, 1889.

Application filed April 9, 1889- To allwhom it may concern;

Be it known that I, VIRGIL'W. BLANCHARD, of New. York, in the county of New York and State of New York have invented certain new and useful Improvements in Steam-Generators; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this Figure 1 is a perspective view of my improved steam-generator. Fig. 2 is a vertical section, enlarged, through one of the vertical subdivided legs, showing portions of the tubes broken away. Fig. 31s a horizontal diametrical section through a-duplex tube and its pipe. Fig. 4 is a cross-section through the duplex tube, taken in the plane indicated by dotted line m m, Fig. 3. Fig. 5 is a detail sectional view illustrating the manner of packing the shaft of the pump.

My invention relates to tubular steam-generators, and my object is to improve the construction of such generators by so construct ing and connecting the parts thereof that ample allowance is made for [unequal expansion and contraction of the parts and each section of the generator and tubes can be independently connected or removed for repairs. This objectis effected by the devices which are hereinafter clearly described and Referring by letter to the drawings, A designates a casing within which is my improved steam-generator. This casing preferably has its walls composed of an internal lining of fire-brick a, a layer 1) of asbestus paper or-other refractory material, a layer 0 of porous or pulverized fire-brick, and an external shell dof cast plates or boiler-iron. The top of the casing is double, the external shell rising above the wall proper thereof, leaving a space W, and this top has a manhole A in it leading into said chamber and closed by a plate A. Iprefer to fillthe space W with mineral wool or other non-conducting material.

'B designates a horizontal transverse pipe or drum, which is sustained substantially Serial 110,306,537. (No model.)

upon the floor of the casing A within thesame by means of a pedestal B, which is preferably cast hollow to contain water, and may be incased with masonry, if desired, for additional protection from the heat. This pipe is cast with screw-tapped couplings b' and it is connected" at one end to a feed-pipe B that extends through the wall of easing A to any suitable supply of water.

= Into each one of the couplings b, Iscrewa .vertical leg 0, and I prefer to use a jam-nut Ib and suitable packing to hermetically seal the joint.

Each one of the legs 0 is constructed with a vertical diaphragm O, which "formstwo chambersC G closed at b and 12 The leg 0 is also constructed with couplings 102, into which are screwed horizontal tubes J, .the outer or free ends of which are hermetically closed by caps j. These tubes J are supported by means of sectional partitions arranged as shown in Fig. 1,for the purpose of causing the heated products of combustion to take a zigzag course through the case Aon their way to the outlet 0, and thus circulate through every part of the chamber within said case. Inside of each tube J is a smaller tube H, which is open at both ends and screwed or properly secured to the diaphragm O at one end and centered bya spider s at or near the other end, as clearly shown in Fig. 3. The upper terminal portion 0 of each leg 0 is at right angles to the longitudinal axis thereof and communicates with a horizontal transverse pipe E in space W by means of a short pipe D. The pipe E by a coupling F communicates with a steam-dome G, provided with a safety-valve G and a steam-pipe G leading to an engine. The steam-drum communicates with a water-forcing engine M by means of a pipe L, and this engine communicates with the pipe B by means of a pipe The engine is used to give a forced mechanical circulation to the water in the generator, sending the latter through the legs, tubes, and drum; but the engine might in some instances be dispensed with and the natural circulation of the water depended upon.

, lVhen the generator is in use, the water and steam pass from the pipe B through the m e h S P. m e h S. 2 m

mm M V {No Model.)

No. 413.909. Patented 001:. 29, 1889.

WITNESSES (No Model.) 2 Sheets-Sheet 2,

v. W. BLANGHARD.

' STEAM GOVERNOR.

No. 413.909. Patentd 091;. 29. 1889.

% wgz z'ssz's INTER 2g? (k f UNITED STATES PATENT OFFIcE.

VIRGIL W. BLANOHARD, OF YORK, N. Y., ASSIGNOR TO JOSEPH A.

DAVIS, OF SAME PLACE.

STEAM-GOVERNOR.

SPECIFICATION forming part of Letters Iatent No. 413,909, dated October 29, 1889.

Application filed April 10, 1889. Serial No. 306,638. (No model.)

To all whom it may concern."

Be it known that LVIRGIL W. BLANOHARD,

of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Steam-Governors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which form part of this specification, in which Figure 1 is a plan view, of my steam-governor, showing its connection with the valveaction of an engine and the crank-wheels on Fig. 2 is a sideview thereof, part of the throttle-valve being broken away. Fig. 3 is a side view of the toggle which connects the governor-spindle to the rod which actuates the spindle of the throttleevalve.

This invention relates to noveland valuable improvements on self-governing steam cut-offs.

By the invention,which willbe fully understood from the following description when taken in connection with the annexed drawings, I obtain a self-governing steam cut-01f at once so rapid, delicate, and efficient in action that under the most irregular conditions of load upon the driving-pulley a sufficient and only a sufficient volume of steam will enter the cylinder at any portion of the stroke. as is required to maintain a certain uniform velocity of piston speed in the engine.

The oscillating steam-valves, the crankwheel on the main shaft, and the cam-wheel which works in a cam-groove in said crankwheel are not herein claimed.

In Fig. 2 of the annexed drawings the relative workingposition of the cut-off valve to the two port-valves, as well as the relation of both the port and exhaust valves to the cylinder of the engine, are clearly shown.

In Fig. 1, letA designate theoscillating steam-valve above referred to, which 'is so constructed that it has an almost imperceptible movement in its action.

F designates the base of my centrifugal governor, which should be rigidly secured to the supporting-frame of my engine.

F F designate two curved arms rising from said base, and forming at their juncture above, the bearing Q for the upper part of v the vertically rising and falling spindle K.

H indicates a miter gear-wheel running loose on the spindle K, the latter extending downward into the base F asa guide. .Itwill be observed that the upper surface of the gear-wheel H is provided with ears I I, rising from it on opposite sides of its center, in Which are pivoted angular arms L L, provided with governor-balls M M, which, by means of set-screws, are adjustable vertically on their arms.

I designates a wheel rigidly secured to the spindle K, and provided with a deep groove in its periphery, as shown in Fig. 2, which groove is entered onopposite sides in a horizontal direction by the free ends of the short lateral arms of the centrifugal governor-ball arms L L. As these angular arms L L, with their centrifugal balls, are jointed to the upper surface of the gear-wheel H by the ears I I,

it becomes evident that when rotary motion is communicated to the aforesaid wheel the centrifugal action of the balls M M, by means of the angular arms L L and grooved wheel I, will tend to elevate the spindle K in a vertical direction, and that this tendency will be increased or diminished in proportion as the rotary motion of the gear-wheel is hastened or slackened.

G designates a shaft provided at one extremity with a toothed wheel gearing with the toothed wheel D, keyed on the main shaft 0 of the engine, and at its other extremity with a wheel G, gearing with the miter-wheel H.

N N designate two short arms forming a toggle-joint with the connecting-link P, the latter occupying a mortise in the spindle K, so that a movement of the latter in a vertical direction upward will, through the aforesaid toggle-joint, actuate a connecting-rod B by the connection shown, and through this rod the spindle a of the steam-valve A.

O designates a stifi coiled spring actuating the spindle K downward, and R a series of weights bearing on a collar 12, rigidly secured to the spindle K, said spring serving as an auxiliary to the weights R to depress the 

